Mont Alto, PA Weather & Growing Conditions
Local forecast, frost dates, hardiness zone and planting guidance for Mont Alto, a borough in Franklin County, Pennsylvania.
This Afternoon
80°F
Partly Sunny
Partly sunny, with a high near 80. North wind around 7 mph.
7-day forecast for Mont Alto
| When | Temp | Forecast | Wind | Precip |
|---|---|---|---|---|
| This Afternoon | 80°F | Partly Sunny | 7 mph N | 3% |
| Tonight | 55°F | Mostly Clear | 7 mph NE | 0% |
| Saturday | 76°F | Mostly Sunny | 6 mph E | 3% |
| Saturday Night | 64°F | Mostly Cloudy then Chance Rain Showers | 3 to 10 mph SE | 38% |
| Sunday | 78°F | Showers And Thunderstorms | 6 to 10 mph S | 86% |
| Sunday Night | 60°F | Showers And Thunderstorms | 3 to 10 mph NW | 86% |
| Monday | 69°F | Chance Rain Showers | 10 mph NE | 38% |
| Monday Night | 56°F | Rain Showers Likely | 8 to 12 mph NE | 60% |
| Tuesday | 61°F | Rain Showers Likely | 12 mph NE | 72% |
| Tuesday Night | 51°F | Rain Showers Likely | 13 mph NE | 72% |
| Wednesday | 58°F | Rain Showers Likely | 9 to 13 mph NE | 58% |
| Wednesday Night | 51°F | Chance Showers And Thunderstorms | 12 mph NE | 54% |
| Thursday | 61°F | Chance Showers And Thunderstorms | 7 to 12 mph NE | 52% |
| Thursday Night | 51°F | Chance Rain Showers | 6 mph N | 40% |
Forecast source: National Weather Service (api.weather.gov) for Mont Alto (39.840, -77.556). Updated through the day.
Growing snapshot for Mont Alto
Last spring frost
Apr 27
First fall frost
Oct 20
Growing season
177 days
Hardiness zone
7a
More local growing data for Mont Alto: nearby ZIP 17237 weather · frost dates · planting calendar · Pennsylvania frost dates
Nearby towns & communities
Blue Ridge Summit
Chambersburg
Fayetteville
Fort Loudon
Greencastle
Guilford
Marion
Mercersburg
Orrstown
Pen Mar
Rouzerville
Scotland
State Line
Wayne Heights
Waynesboro
Climate data from the nearest NOAA station, S Mtn, Pa (2.2 mi from Mont Alto). Frost dates are 1991–2020 averages, not a forecast. Page updated Sep 18, 2026.